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Extraction functions

The URL extraction functions extract components from HTTP URLs (or any valid URIs conforming to RFC 2396). The following syntax is supported:

[protocol:][//host[:port]][path][?query][#fragment]

The extracted components do not contain URI syntax separators such as : or ?.

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url_extract_fragment

url_extract_fragment(url) -> varchar

Returns the fragment identifier from url.

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url_extract_host

url_extract_host(url) -> varchar

Returns the host from url.

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url_extract_parameter

url_extract_parameter(url, name) -> varchar

Returns the value of the first query string parameter named name from url. Parameter extraction is handled in the typical manner as specified by RFC 1866.

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url_extract_path

url_extract_path(url) -> varchar

Returns the path from url.

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url_extract_port

url_extract_port(url) -> bigint

Returns the port number from url.

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url_extract_protocol

url_extract_protocol(url) -> varchar

Returns the protocol from url:

SELECT url_extract_protocol('http://localhost:8080/req_path');
-- http

SELECT url_extract_protocol('https://127.0.0.1:8080/req_path');
-- https

SELECT url_extract_protocol('ftp://path/file');
-- ftp

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url_extract_query

url_extract_query(url) -> varchar

Returns the query string from url.

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Encoding functions

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url_encode

url_encode(value) -> varchar

Escapes value by encoding it so that it can be safely included in URL query parameter names and values:

  • Alphanumeric characters are not encoded.
  • The characters ., -, * and _ are not encoded.
  • The ASCII space character is encoded as +.
  • All other characters are converted to UTF-8 and the bytes are encoded as the string %XX where XX is the uppercase hexadecimal value of the UTF-8 byte.

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url_decode

url_decode(value) -> varchar

Unescapes the URL encoded value. This function is the inverse of url_encode().